EP4329025A1 - Procédé de fabrication d'une cellule électrochimique - Google Patents

Procédé de fabrication d'une cellule électrochimique Download PDF

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Publication number
EP4329025A1
EP4329025A1 EP21937880.9A EP21937880A EP4329025A1 EP 4329025 A1 EP4329025 A1 EP 4329025A1 EP 21937880 A EP21937880 A EP 21937880A EP 4329025 A1 EP4329025 A1 EP 4329025A1
Authority
EP
European Patent Office
Prior art keywords
positive electrode
negative electrode
film
unit cell
manufacturing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21937880.9A
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German (de)
English (en)
Inventor
Yasuyuki UTO
Hiromitsu Mishima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyocera Corp
Original Assignee
Kyocera Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kyocera Corp filed Critical Kyocera Corp
Publication of EP4329025A1 publication Critical patent/EP4329025A1/fr
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0436—Small-sized flat cells or batteries for portable equipment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/049—Processes for forming or storing electrodes in the battery container
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a method for manufacturing an electrochemical cell.
  • a proposed electrochemical cell uses a semisolid electrode.
  • the electrochemical cell has a structure in which a separator is sandwiched between a first structure and a second structure.
  • the first structure has a structure with a first current collector and a first electrode stacked
  • the second structure has a structure with a second current collector and a second electrode stacked.
  • the first electrode is one of a positive electrode and a negative electrode
  • the second electrode is the other of the positive electrode and the negative electrode.
  • a proposed technique covers the first structure, the second structure, and the separator with a package having a hole for releasing a gas that can be generated in electrodes such as the first electrode and the second electrode (e.g., Patent Document 1).
  • Patent Document 1 WO 2019/087956 pamphlet
  • a method for manufacturing an electrochemical cell includes: a process A of manufacturing a first structure by stacking a first film, a first current collector, and a first electrode; a process B of manufacturing a second structure by stacking a second film, a second current collector, and a second electrode; a process C of disposing a separator between the first structure and the second structure; a process D of manufacturing a unit cell by sealing an outer periphery of the first film and an outer periphery of the second film; and a process E of charging the unit cell while pressurizing the unit cell in a stacking direction of the first structure, the separator, and the second structure.
  • FIG. 1 is a plan view seen along a stacking direction (hereinafter, simply in a plan view) of the unit cell 100.
  • FIG. 2 is a view illustrating an A-A cross section of the unit cell 100 illustrated in FIG. 1 .
  • FIG. 3 is a view illustrating a B-B cross section of the unit cell 100 illustrated in FIG. 1 .
  • the unit cell 100 is an example of an electrochemical cell.
  • the direction in which a positive electrode structure 110, a separator 130, and a negative electrode structure 120 are stacked is referred to as a "stacking direction".
  • the unit cell 100 may have a rectangular shape in a plan view.
  • the unit cell 100 may have a pair of lateral sides 101A and 101B along the lateral direction and a pair of longitudinal sides 102A and 102B along the longitudinal direction.
  • the unit cell 100 includes the positive electrode structure 110, the negative electrode structure 120, and the separator 130.
  • the positive electrode structure 110 includes a positive electrode film 111, a positive electrode current collector 112, and a positive electrode 113.
  • the positive electrode structure 110 is a stack body of the positive electrode film 111, the positive electrode current collector 112, and the positive electrode 113.
  • the positive electrode structure 110 is an example of a first structure.
  • the positive electrode film 111 is made of a material having insulating properties and air impermeability.
  • the positive electrode film 111 is an example of a first film.
  • the positive electrode film 111 has a sheet shape.
  • the positive electrode film 111 may have a multilayer structure made of two or more layers (e.g., three layers).
  • the positive electrode film 111 may include an outer layer exposed to the outside of the unit cell 100, an inner layer exposed to the inside of the unit cell 100, and an intermediate layer disposed between the outer layer and the inner layer.
  • the outer layer may be made of an insulating material.
  • the insulating material constituting the outer layer can use a polymer film made of at least one or more materials selected from the group consisting of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), nylon, high purity polyethylene (HDPE), oriented polypropylene (o-PP), polyvinyl chloride (PVC), polyimide (PI), and polysulfone (PSU).
  • PET polyethylene terephthalate
  • PBT polybutylene terephthalate
  • nylon high purity polyethylene
  • HDPE high purity polyethylene
  • o-PP oriented polypropylene
  • PVC polyvinyl chloride
  • PI polyimide
  • PSU polysulfone
  • the intermediate layer may be made of a metal material.
  • the metal material constituting the intermediate layer can use a layer (a foil, a substrate, a film, or the like) made of one or more materials selected from the group consisting of aluminum (Al), copper (Cu), and stainless steel (SUS).
  • the inner layer may be made of an insulating material.
  • the insulating material constituting the inner layer can use a polymer film made of one or more materials selected from the group consisting of cast polypropylene (c-PP), polyethylene (PE), ethylene vinyl acetate (EVA), polyethylene terephthalate (PET), polyvinyl acetate (PVA), polyamide (PA), tacky acrylic, an ultraviolet (UV) curable resin, an electron beam (EB) curable resin, and an infrared (IR) curable resin.
  • the inner layer may be made of a flame-retardant material.
  • the flame-retardant material constituting the inner layer can use one or more materials selected from the group consisting of polyether ether ketone (PEEK), polyethylene naphthalene (PEN), polyether sulfone (PES), polyimide (PI), polyethylene sulfide (PPS), and polyethylene oxide (PPO).
  • PEEK polyether ether ketone
  • PEN polyethylene naphthalene
  • PES polyether sulfone
  • PI polyimide
  • PPS polyethylene sulfide
  • PPO polyethylene oxide
  • the positive electrode film 111 may have a two-layer structure or a single-layer structure.
  • the positive electrode film 111 may contain a combustion inhibiting substance.
  • the positive electrode current collector 112 has a function of transferring electrons to and from the positive electrode 113.
  • the positive electrode current collector 112 is an example of a first current collector.
  • the positive electrode current collector 112 is disposed between the positive electrode film 111 and the positive electrode 113.
  • the positive electrode current collector 112 may have a sheet shape or may have a mesh shape.
  • the thickness of the positive electrode current collector 112 may be 1 to 40 ⁇ m.
  • the positive electrode current collector 112 is made of a metal material.
  • the metal material constituting the positive electrode current collector 112 can use one or more materials selected from the group consisting of stainless steel, nickel, a nickel-chromium alloy, aluminum, titanium, copper, lead, a lead alloy, a heat-resistant metal, and a noble metal.
  • the positive electrode current collector 112 may be coated with a conductive material.
  • the conductive material can use one or more materials selected from the group consisting of a metal, a metal oxide, and carbon.
  • the metal can use one or more materials selected from the group consisting of platinum (Pt), gold (Au), and nickel (Ni).
  • the metal oxide can use vanadium oxide.
  • the positive electrode current collector 112 may include a positive electrode terminal 112A.
  • the positive electrode terminal 112A may extend outward the positive electrode film 111 in a plan view.
  • the positive electrode terminal 112A may extend outward the positive electrode film 111 at the lateral side 101A.
  • the positive electrode terminal 112A may be formed integrally with the positive electrode current collector 112.
  • the positive electrode 113 may be stacked on at least part of the positive electrode terminal 112A. In an aspect in which two or more of the unit cells 100 are stacked (the stack cell 200 described later), the positive electrode terminal 112A is electrically connected to the positive electrode terminal 112A of another unit cell 100 (parallel connection).
  • the positive electrode 113 is electrically connected to the positive electrode current collector 112.
  • the positive electrode is an example of a first electrode.
  • the positive electrode 113 receives electrons from the positive electrode current collector 112 in the discharge operation and emits electrons to the positive electrode current collector 112 in the charge operation.
  • the positive electrode 113 is an electrochemically active semisolid.
  • the positive electrode 113 is a mixture of a positive electrode active material and an electrolytic solution.
  • the positive electrode 113 may be a mixture of a liquid phase and a solid phase such as a clay-like slurry, a particulate suspension, a colloidal suspension, an emulsion, a gel, or a micelle.
  • the positive electrode 113 is disposed between the positive electrode current collector 112 and the separator 130.
  • the positive electrode 113 has a layer shape. The thickness of the positive electrode may be 250 to 2000 ⁇ m.
  • the positive electrode 113 may contain, as a positive electrode active material, a nickel-cobalt-aluminum-based lithium composite oxide (NCA), a spinel-based lithium manganese oxide (LMO), a lithium iron phosphate (LFP), a lithium cobalt oxide (LCO), a nickel-cobalt-manganese-based lithium composite oxide (NCM), or the like.
  • the positive electrode 113 may contain, as a positive electrode active material, a solid-state compound known to those skilled in the art, for example, used in a nickel-hydrogen battery, a nickel-cadmium battery, or the like.
  • the positive electrode 113 may contain, as a positive electrode active material, LiCoO 2 or LiNiO 2 doped with Mg, for example.
  • the negative electrode structure 120 includes a negative electrode film 121, a negative electrode current collector 122, and a negative electrode 123.
  • the negative electrode structure 120 is a stack body of the negative electrode film 121, the negative electrode current collector 122, and the negative electrode 123.
  • the negative electrode structure 120 is an example of a second structure.
  • the negative electrode film 121 is made of a material having insulating properties and air impermeability.
  • the negative electrode film 121 is an example of a second film.
  • the negative electrode film 121 has a sheet shape.
  • the negative electrode film 121 may have a multilayer structure made of two or more layers (e.g., three layers).
  • the configuration of the negative electrode film 121 may be same as, and/or similar to, that of the positive electrode film 111, and the details of the negative electrode film 121 are omitted.
  • the negative electrode current collector 122 has a function of transferring electrons to and from the negative electrode 123.
  • the negative electrode current collector 122 is an example of a second current collector.
  • the negative electrode current collector 122 is disposed between the negative electrode film 121 and the negative electrode 123.
  • the negative electrode current collector 122 may have a sheet shape or may have a mesh shape.
  • the thickness of the negative electrode current collector 122 may be 1 to 20 ⁇ m.
  • the negative electrode current collector 122 is made of a metal material.
  • the metal material constituting the negative electrode current collector 122 can use one or more materials selected from the group consisting of stainless steel, nickel, a nickel-chromium alloy, titanium, lead oxide, and a noble metal.
  • the negative electrode current collector 122 may be coated with a conductive material. As the conductive material,
  • the negative electrode current collector 122 may include a negative electrode terminal 122A.
  • the negative electrode terminal 122A may extend outward the negative electrode film 121 in a plan view.
  • the negative electrode terminal 122A may extend outward the negative electrode film 121 at the lateral side 101A.
  • the negative electrode terminal 122A may be formed integrally with the negative electrode current collector 122.
  • the negative electrode 123 may be stacked on at least part of the negative electrode terminal 122A. In an aspect in which the two or more unit cells 100 are stacked (the stack cell 200 described later), the negative electrode terminal 122A is electrically connected to the negative electrode terminal 122A of another unit cell 100 (parallel connection).
  • the negative electrode 123 is electrically connected to the negative electrode current collector 122.
  • the negative electrode 123 is an example of a second electrode.
  • the negative electrode 123 emits electrons from the negative electrode current collector 122 in the discharge operation and receives electrons from the negative electrode current collector 122 in the charge operation.
  • the negative electrode 123 is an electrochemically active semisolid. In other words, the negative electrode 123 is a mixture of a negative electrode active material and an electrolytic solution.
  • the negative electrode 123 may be a mixture of a liquid phase and a solid phase such as a clay-like slurry, a particulate suspension, a colloidal suspension, an emulsion, a gel, or a micelle.
  • the negative electrode 123 is disposed between the negative electrode current collector 122 and the separator 130.
  • the negative electrode 123 has a layer shape.
  • the thickness of the positive electrode may be 250 to 2000 ⁇ m.
  • the negative electrode 123 may contain, as a negative electrode active material, a carbon-based material such as graphite, hard carbon, soft carbon, a carbon nanotube, graphene, or the like.
  • the negative electrode 123 may contain, for example, a titanium-based oxide such as lithium titanate or titanium dioxide.
  • the negative electrode 123 may contain, for example, a transition metal compound containing iron, cobalt, copper, manganese, nickel, or the like.
  • the positive electrode 113 and the negative electrode 123 may contain an electrolytic solution.
  • the electrolytic solution may be a carbonate-based solvent.
  • the carbonate-based solvent may be ⁇ -butyrolactone, ethylene carbonate, or both ⁇ -butyrolactone and ethylene carbonate.
  • the carbonate-based solvent may contain another solvent as long as it contains at least one of ⁇ -butyrolactone and ethylene carbonate. Examples of other solvents include propylene carbonate, dimethyl carbonate, dimethoxyethane, diethyl carbonate, tetrahydrofuran, and triethylene glycol dimethyl ether.
  • the carbonate-based solvent may have a vapor pressure of less than 0.1 kPa at 25°C.
  • the positive electrode 113 and the negative electrode 123 may contain an additive.
  • the additive may contain, for example, at least one of maleic anhydride, lithium bis (oxalate) borate, or biphenyl.
  • the separator 130 is disposed between the positive electrode structure 110 and the negative electrode structure 120.
  • the unit cell 100 has a function of reducing a short circuit between the positive electrode structure 110 and the negative electrode structure 120.
  • the separator 130 may be made of an insulator.
  • the separator 130 may be made of a polymer having ductility and elasticity.
  • the separator 130 may be made of one or more materials selected from the group consisting of polyolefin, polyvinyl chloride, nylon, fluorocarbon, and polystyrene.
  • the positive electrode film 111 and the negative electrode film 121 are respectively sealed outside the positive electrode 113 and the negative electrode 123 in a plan view, and the positive electrode 113 and the negative electrode 123 are accommodated in respective packages made of the positive electrode film 111 and the negative electrode film 121.
  • the package made of the positive electrode film 111 and the negative electrode film 121 has an opening 105A and an opening 105B.
  • the opening 105A may be an opening communicating with the inside and the outside of the package on the positive electrode 113 side from the separator 130.
  • the opening 105B may be an opening communicating with the inside and the outside of the package on the negative electrode 123 side from the separator 130.
  • the opening 105A may be formed in the lateral side 101B provided on the opposite side of the lateral side 101A.
  • the opening 105A may be formed at a corner formed by the lateral side 101A and the longitudinal side 102B. That is, the opening 105A may be formed at a diagonal position of the unit cell 100 with respect to the positive electrode terminal 112A.
  • the size of the opening 105A may be 0.1 to 10 mm in the lateral direction of the unit cell 100 or may be 10 to 30 mm in the longitudinal direction of the unit cell 100.
  • the opening 105B may be formed in the lateral side 101B provided on the opposite side of the lateral side 101A.
  • the opening 105B may be formed at a corner formed by the lateral side 101A and the longitudinal side 102A. That is, the opening 105B may be formed at a diagonal position of the unit cell 100 with respect to the negative electrode terminal 122A.
  • the size of the opening 105B may be 0.1 to 10 mm in the lateral direction of the unit cell 100 or may be 10 to 30 mm in the longitudinal direction of the unit cell 100.
  • the opening 105A and the opening 105B allow a gas generated by a side reaction of charge and discharge to be released from the inside to the outside of the unit cell 100 (the positive electrode structure 110 or the negative electrode structure 120). Therefore, a gas can be less likely to be accumulated between the positive electrode current collector 112 and the positive electrode 113, between the negative electrode current collector 122 and the negative electrode 123, between the positive electrode 113 and the separator 130, or between the negative electrode 123 and the separator 130. As a result, the efficiency of the main reaction of charge and discharge can be less likely to decrease, and the battery capacity can be less likely to decrease.
  • FIG. 4 is a view illustrating a cross section of the stack cell 200.
  • the stack cell 200 may be an example of the electrochemical cell.
  • the stack cell 200 is a stack body in which the two or more unit cells 100 are stacked.
  • the two or more unit cells 100 are stacked in the same direction as the stacking direction of the positive electrode structure 110, the separator 130, and the negative electrode structure 120.
  • the stacking direction of the two or more unit cells 100 may be considered to have the same meaning as the stacking direction of the positive electrode structure 110, the separator 130, and the negative electrode structure 120.
  • the stack body is sealed in a package 150. A gap may be formed between an inner wall of the package 150 and the stack body of the unit cells 100.
  • the package 150 may be made of two members (a first package member 150A and a second package member 150B) having a sheet shape.
  • the first package member 150A has a tray shape having a first recessed portion 151A and a first flange portion 152A.
  • the unit cells 100 are disposed in the first recessed portion 151A with a gap formed between the inner wall of the first recessed portion 151A formed in the first package member 150A and the unit cells 100.
  • the second package member 150B has a tray shape having a second recessed portion 151B and a second flange portion 152B.
  • the unit cells 100 are disposed in the second recessed portion 151B with a gap formed between the inner wall of the second recessed portion 151B formed in the second package member 150B and the unit cells 100.
  • the first flange portion 152A is formed over the entire outer periphery of the first recessed portion 151A
  • the second flange portion 152B is formed over the entire outer periphery of the second recessed portion 151B. Therefore, sealing the first flange portion 152A and the second flange portion 152B allows the package 150 made of the first package member 150A and the second package member 150B to accommodate the stack body of the unit cells 100.
  • the package 150 may be made of an air impermeable member.
  • the package 150 may be made of a hydrophobic member.
  • the package 150 may be made of a metal material.
  • the metal material can use one or more materials selected from the group consisting of stainless steel, aluminum, and copper.
  • the positive electrode terminal 112A of the unit cell 100 is electrically connected to the positive electrode terminal 112A of another unit cell 100 (parallel connection).
  • the negative electrode terminal 122A of unit cell 100 is electrically connected to the negative electrode terminal 122A of another unit cell 100 (parallel connection).
  • a pair of extraction terminals 210 is exposed to the outside of the package 150.
  • the pair of extraction terminals 210 may be made of the positive electrode terminal 112A and the negative electrode terminal 122A of at least one unit cell 100 included in the stack cell 200 or may be made of a member different from the positive electrode terminal 112A and the negative electrode terminal 122A of the unit cells 100.
  • the package made of the positive electrode film 111 and the negative electrode film 121 may be referred to as a first package.
  • the package 150 may be referred to as a second package.
  • the positive electrode current collector 112 is stacked on the positive electrode film 111.
  • the positive electrode current collector 112 may be stacked by bonding the positive electrode current collector 112 to the positive electrode film 111.
  • the positive electrode current collector 112 may be stacked by printing a material constituting the positive electrode current collector 112 onto the positive electrode film 111.
  • the positive electrode 113 is stacked on the positive electrode current collector 112.
  • the positive electrode 113 may be stacked by applying a material constituting the positive electrode 113 to the positive electrode current collector 112.
  • the positive electrode 113 may be stacked extending outward the positive electrode current collector 112 in a plan view.
  • the negative electrode current collector 122 is stacked on the negative electrode film 121.
  • the negative electrode current collector 122 may be stacked by bonding the negative electrode current collector 122 to the negative electrode film 121.
  • the negative electrode current collector 122 may be stacked by printing a material constituting the negative electrode current collector 122 onto the negative electrode film 121.
  • the negative electrode 123 is stacked on the negative electrode current collector 122.
  • the negative electrode 123 may be stacked by applying a material constituting the negative electrode 123 to the negative electrode current collector 122.
  • the negative electrode 123 may be stacked extending outward the negative electrode current collector 122 in a plan view.
  • the separator 130 is disposed between the positive electrode structure 110 and the negative electrode structure 120.
  • the separator 130 is disposed extending outward from the outer periphery of the positive electrode structure 110 and the outer periphery of the negative electrode structure 120 in a plan view.
  • the outer periphery of the positive electrode film 111 and the outer periphery of the negative electrode film 121 are sealed.
  • the method for sealing may be ultrasonic sealing or thermocompression bonding sealing.
  • the separator 130 is sealed together with the positive electrode film 111 and the negative electrode film 121 on the inside of the outer periphery of the separator 130.
  • the outer periphery of the positive electrode film 111 and the outer periphery of the negative electrode film 121 are respectively sealed outside the positive electrode 113 and the negative electrode 123 while leaving a positive electrode non-sealing region in at least part of the positive electrode film 111.
  • the outer periphery of the positive electrode film 111 includes a positive electrode sealing region 111A extending outward from the outer periphery of the positive electrode 113 and a positive electrode cutout region 111B entering an inside of the outer periphery of the positive electrode 113.
  • the positive electrode non-sealing region is formed on the positive electrode cutout region 111B by sealing the positive electrode film 111 and the negative electrode film 121 on the positive electrode sealing region 111A and the positive electrode cutout region 111B.
  • the positive electrode cutout region 111B enters the inside of the sealing position, the positive electrode film 111 is not present at the sealing position in the positive electrode cutout region 111B, and thus the above-described positive electrode non-sealing region is formed. That is, the positive electrode non-sealing region made of the positive electrode cutout region 111B constitutes the opening 105A described above.
  • the positive electrode cutout region 111B may be formed at a diagonal position of the unit cell 100 (the positive electrode structure 110) with respect to the positive electrode terminal 112A.
  • the negative electrode structure 120 and the separator 130 are omitted in FIG. 8 for convenience of description.
  • the sealing position may be the inside of the outer periphery of the separator 130.
  • the outer periphery of the positive electrode film 111 and the outer periphery of the negative electrode film 121 are respectively sealed outside the positive electrode 113 and the negative electrode 123 while leaving a negative electrode non-sealing region in at least part of the negative electrode film 121.
  • the outer periphery of the negative electrode film 121 includes a negative electrode sealing region 121A extending outward from the outer periphery of the negative electrode 123 and a negative electrode cutout region 121B entering an inside of the outer periphery of the negative electrode 123.
  • the negative electrode non-sealing region is formed on the negative electrode cutout region 121B by sealing the positive electrode film 111 and the negative electrode film 121 on the negative electrode sealing region 121A and the negative electrode cutout region 121B.
  • the negative electrode cutout region 121B enters the inside of the sealing position, the negative electrode film 121 is not present at the sealing position in the negative electrode cutout region 121B, and thus the above-described negative electrode non-sealing region is formed. That is, the negative electrode non-sealing region made of the negative electrode cutout region 121B constitutes the opening 105B described above.
  • the negative electrode cutout region 121B may be formed at a diagonal position of the unit cell 100 (the negative electrode structure 120) with respect to the negative electrode terminal 122A. Note that the positive electrode structure 110 is omitted in FIG. 9 for convenience of description. In a plan view, the sealing position may be the inside of the outer periphery of the separator 130.
  • the stack body of unit cells 100 is obtained by stacking the two or more unit cells 100. Subsequently, the positive electrode terminal 112A of the unit cell 100 is electrically connected to the positive electrode terminal 112A of another unit cell 100 (parallel connection). Similarly, the negative electrode terminal 122A of unit cell 100 is electrically connected to the negative electrode terminal 122A of another unit cell 100 (parallel connection).
  • the stack body of the unit cells 100 is disposed in the package 150.
  • the unit cells 100 are disposed in the first recessed portion 151A with a gap formed between the inner wall of the first recessed portion 151A formed in the first package member 150A and the unit cells 100.
  • the unit cells 100 are disposed in the second recessed portion 151B with a gap formed between the inner wall of the second recessed portion 151B formed in the second package member 150B and the unit cells 100.
  • the first package member 150A in which the unit cells 100 are disposed and the second package member 150B in which the unit cells 100 are disposed are stacked.
  • first portions of the first package member 150A (the first flange portion 152A) and the second package member 150B (the second flange portion 152B) need not be sealed, and second portions of the first package member 150A (the first flange portion 152A) and the second package member 150B (the second flange portion 152B) may be sealed.
  • the first portion may be a portion through which the extraction terminal 210 is extracted to the outside of the package 150.
  • the second portion may be a portion other than the first portion.
  • the two or more unit cells 100 are charged while the two or more unit cells 100 are pressurized in the stacking direction with the two or more unit cells 100 stacked.
  • Such charge may be referred to as precharge.
  • the precharge can generate a gas at the positive electrode 113 and the negative electrode 123 in the production stage of the unit cells 100 and release the gas generated at the positive electrode 113 and the negative electrode 123 in advance.
  • the precharge may be performed under a reduced-pressure atmosphere.
  • the reduced-pressure atmosphere may be, for example, 50 kPa or less.
  • the reduced-pressure atmosphere may be 100 Pa or less.
  • the reduced-pressure atmosphere may include a vacuum atmosphere. At this stage, the first portion needs not be sealed.
  • the first package member 150A and the second package member 150B are entirely sealed.
  • the first portion described above is sealed.
  • the first portion may be a portion through which the extraction terminal 210 is extracted to the outside of the package 150.
  • step S11 the positive electrode structure 110 is manufactured by stacking the positive electrode film 111, the positive electrode current collector 112, and the positive electrode 113 (see FIG. 5 ).
  • Step S11 is an example of a process A.
  • step S12 the negative electrode structure 120 is manufactured by stacking the negative electrode film 121, the negative electrode current collector 122, and the negative electrode 123 (see FIG. 6 ).
  • Step S12 is an example of a process B.
  • step S13 the separator 130 is disposed between the positive electrode structure 110 and the negative electrode structure 120 (see FIG. 7 ).
  • Step S13 is an example of a process C.
  • step S14 the unit cell 100 is manufactured by sealing the outer periphery of the positive electrode film 111 and the outer periphery of the negative electrode film 121 (see FIG. 7 ).
  • sealing is performed while leaving the positive electrode non-sealing region (the positive electrode cutout region 111B) in at least part of the outer periphery of the positive electrode film 111.
  • Step S14 is an example of a process D.
  • Steps S11 to S14 are the processes of manufacturing the unit cell 100.
  • step S11 is performed before step S12, but step S12 may be performed before step S11.
  • step S21 the two or more unit cells 100 are stacked, and the stack body of the unit cells 100 is disposed in the package 150 (see FIG. 10 ).
  • step S22 the second portions of the first package member 150A and the second package member 150B are sealed (see FIG. 10 ).
  • the sealing of the second portions may be referred to as first sealing.
  • Step S23 the two or more unit cells 100 are charged while the two or more unit cells 100 are pressurized in the stacking direction of the two or more unit cells 100 (see FIG. 11 ).
  • Step S23 (precharge) may be performed under a reduced-pressure atmosphere.
  • the reduced-pressure atmosphere may include a vacuum atmosphere.
  • step S24 the stack cell 200 is manufactured by sealing the first portions of the first package member 150A and the second package member 150B (see FIG. 11 ).
  • the sealing of the first portions may be referred to as second sealing.
  • the first portion may be a portion through which the extraction terminal 210 is extracted to the outside of the package 150.
  • the precharge (step S23) is performed after the unit cells 100 are disposed in the package 150 and before the package 150 is completely sealed.
  • Steps S21 to S24 are the processes of manufacturing the stack cell 200.
  • the first sealing (step S22) and the second sealing (step S24) are performed separately, but the first sealing and the second sealing may be performed simultaneously. In such a case, the first sealing and the second sealing may be performed after the precharge (step S23).
  • the unit cell 100 may be manufactured by sealing the outer periphery of the positive electrode film 111 and the outer periphery of the negative electrode film 123 outside the positive electrode 113 and the negative electrode 111, respectively, while leaving the positive electrode non-sealing region (e.g., the positive electrode cutout region 111B) in at least part of the outer periphery of the positive electrode film 121.
  • the positive electrode non-sealing region (the opening 105A) to be formed as a part of the process of sealing the positive electrode film 111 and the negative electrode film 121.
  • the positive electrode cutout region 111B is formed at a position overlapping with the sealing position, allowing the opening 105A to be easily formed. Therefore, the unit cell 100 that can release the gas that can be generated in the positive electrode 113 can be appropriately manufactured.
  • the unit cell 100 may be manufactured by sealing the outer periphery of the positive electrode film 111 and the outer periphery of the negative electrode film 123 outside the positive electrode 113 and the negative electrode 121, respectively, while leaving the negative electrode non-sealing region (e.g., the negative electrode cutout region 121B) in at least part of the outer periphery of the negative electrode film 121.
  • the negative electrode non-sealing region the opening 105B
  • the positive electrode cutout region 111B is formed at a position overlapping with the sealing position, allowing the opening 105A to be easily formed. Therefore, the unit cell 100 that can release the gas that can be generated in the negative electrode 123 can be appropriately manufactured.
  • a gap may be formed between the inner wall of the package 150 and the unit cells 100. Therefore, the gas that can be generated in the positive electrode 113 or the negative electrode 123 can be accommodated in the gap, allowing the accumulation of the gas at least in the unit cells 100 to be reduced.
  • the separator 130 may extend outward the outer periphery of the positive electrode structure 110 and the outer periphery of the negative electrode structure 120 in a plan view, and the separator 130 may be sealed together with the positive electrode film 111 and the negative electrode film 121. Such a configuration allows a short circuit between the positive electrode structure 110 and the negative electrode structure 120 to be appropriately reduced.
  • the unit cells 100 may be charged while being pressurized in the stacking direction of the positive electrode structure 110, the separator 130, and the negative electrode structure 120 (precharge).
  • precharge Such a configuration allows the precharge to generate a gas at the positive electrode 113 and the negative electrode 123 in the production stage of the unit cells 100 and the gas generated at the positive electrode 113 and the negative electrode 123 to be released in advance. Therefore, the gas generated in the positive electrode 113 and the negative electrode 123 can be effectively released in advance.
  • the precharge may be performed under a reduced-pressure atmosphere.
  • a reduced-pressure atmosphere allows the gas generated in the positive electrode 113 and the negative electrode 123 to be efficiently released.
  • the positive electrode non-sealing region e.g., the positive electrode cutout region 111B
  • the negative electrode non-sealing region e.g., the negative electrode cutout region 121B
  • Such a configuration allows the gas generated in the negative electrode 123 to be effectively released in advance.
  • precharge may be performed with the two or more unit cells 100 stacked.
  • Such a configuration allows precharge of the two or more unit cells 100 to be simultaneously performed and the precharge to be efficiently performed.
  • precharge may be performed before the package 150 is completely sealed. Such a configuration, the gas generated in the positive electrode 113 and the negative electrode 123 to be efficiently released.
  • the positive electrode structure 110 is the first structure has been exemplified.
  • the positive electrode structure 110 may be the second structure. In such a case, the "positive electrode” may be read as "second”.
  • the case where the negative electrode structure 120 is the second structure has been exemplified.
  • the negative electrode structure 120 may be the first structure. In such a case, the "negative electrode” may be read as "first”.
  • the package 150 covers the stack body of the two or more unit cells 100.
  • the package 150 may cover one unit cell 100.
  • precharge step S23 illustrated in FIG. 12
  • precharge may be performed for each unit cell 100.
  • the charge of the unit cells 100 is exemplified as the process for releasing the gas in the process of manufacturing the unit cells 100.
  • the disclosure described above is not limited to this example.
  • the above-described process may include discharge of the unit cells 100 in addition to charge of the unit cells 100.
  • the package 150 is made of the first package member 150A and the second package member 150B has been exemplified.
  • the disclosure described above is not limited to this example.
  • the package 150 may have a bag shape without the second portion. In such a case, the process of sealing the second portion (S22 illustrated in FIG. 12 ) may be omitted.
  • the disclosure described above exemplifies the case where the opening 105A and the opening 105B are configured with the unit cell 100 being formed by sealing the positive electrode film 111 having the positive electrode non-sealing region and the negative electrode film 121 having the negative electrode non-sealing region.
  • the disclosure described above is not limited to this example.
  • the opening 105A and the opening 105B may be formed after the unit cell 100 is sealed without a non-sealing region.
  • the opening 105A and the opening 105B may be formed by cutting out part of the unit cell 100 after sealing the positive electrode film 111 not having the positive electrode non-sealing region and the negative electrode film 121 not having the negative electrode non-sealing region.
  • the opening 105A and the opening 105B may be formed by making a hole in the unit cell 100 after sealing the positive electrode film 111 not having the positive electrode non-sealing region and the negative electrode film 121 not having the negative electrode non-sealing region.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Secondary Cells (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
EP21937880.9A 2021-04-21 2021-04-21 Procédé de fabrication d'une cellule électrochimique Pending EP4329025A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/016216 WO2022224386A1 (fr) 2021-04-21 2021-04-21 Procédé de fabrication d'une cellule électrochimique

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EP4329025A1 true EP4329025A1 (fr) 2024-02-28

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JP (1) JPWO2022224386A1 (fr)
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JP4720065B2 (ja) * 2001-09-04 2011-07-13 日本電気株式会社 フィルム外装電池及び組電池
JP5196598B2 (ja) * 2010-06-08 2013-05-15 一般財団法人電力中央研究所 積層型二次電池
JP5924689B2 (ja) * 2012-11-26 2016-05-25 三菱電機株式会社 電気二重層キャパシタモジュールの製造方法
JP2015015087A (ja) * 2013-07-03 2015-01-22 石原産業株式会社 非水電解質二次電池の製造方法
CN113300029A (zh) * 2015-06-18 2021-08-24 24M技术公司 单袋电池单元以及制造方法
JP7005649B2 (ja) 2017-10-30 2022-01-21 京セラ株式会社 電気化学セルおよび電気化学セルスタック

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WO2022224386A1 (fr) 2022-10-27
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